Dynamic Modulus and Rutting Performance of As-Built Hot-Mix Asphalt Using Small-Scale Specimens
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 5
Abstract
The dynamic modulus of asphalt concrete (AC) mixtures is commonly measured using cylindrical specimens having a 100-mm diameter and a 150-mm height (full-size specimens). Testing as-built AC mixtures using this geometry is rarely possible because the required specimen height is greater than the typical AC lift thickness. In this study, the feasibility of using small-scale cylindrical specimens to measure the dynamic modulus of AC mixtures was investigated. Dynamic modulus tests were conducted on full-size and two small-scale (common height of 110 mm and two diameters of 38 and 50 mm) geometries extracted from gyratory-compacted samples. Both small geometries showed similar performances to full-size specimens except at high temperature of 37.8°C, where they resulted in greater dynamic modulus values. Second, field cores were collected from highways to perform the dynamic modulus and Hamburg wheel tracker tests, and the two test results were correlated. The findings showed that small-scale specimens are capable of measuring the as-built dynamic modulus of AC mixtures and predicting their rutting performance in the laboratory.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors would like to appreciate the financial and technical support from the Manitoba Department of Infrastructure and the City of Winnipeg.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 5 • May 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Jul 11, 2019
Accepted: Sep 23, 2019
Published online: Feb 28, 2020
Published in print: May 1, 2020
Discussion open until: Jul 28, 2020
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